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June 6, 2011: Police say a group of between 15 and 20 teenagers on Saturday night attacked a man parking his scooter near Northwestern University's Streeterville campus before robbing another man near the lake. (Published Wednesday, Jun 8, 2011)

Updated at 12:05 PM CST on Wednesday, Jun 8, 2011

Chicago's Guardian Angels are on the prowl in response to recent mob activity downtown and along the lakefront.

The community safety group plans to begin patrols along the Magnificent Mile and part of the CTA Red Line starting at 3 p.m. Wednesday.

Witness Describes River North Mob Beating

June 7, 2011: Witness describes what he saw in an attack and robbery near Chicago and Wabash avenues. (Published Friday, Jun 10, 2011)

"It's unnecessary violence," Fuentes said. "They're crimes of opportunity, and it's a complete disregard to people in general."

The patrol will also target the Red Line, believed to be the mobs' main method of transportation, between the State and Lake station and the North and Clybourn station.

Fuentes advised commuters to hide their electronic devices and keep an eye out for suspicious activity. If necessary, commuters should report incidents to CTA employees or police with as detailed a description as possible.

Although the patrols are only scheduled for the next few days, Fuentes said the group will continue to patrol for weeks or even the entire summer if the attacks continue.

"It's something that as Guardian Angels we will not tolerate," Fuentes said. "Especially if we see something, we will exercise our right to make a citizen arrest, and if we have to, we will get physically involved."